5 files changed, 107 insertions, 0 deletions
diff --git a/challenge-307/arne-sommer/blog.txt b/challenge-307/arne-sommer/blog.txt
new file mode 100644
index 0000000000..9e4f58421f
--- /dev/null
+++ b/challenge-307/arne-sommer/blog.txt
@@ -0,0 +1 @@
+https://raku-musings.com/find-check.html
diff --git a/challenge-307/arne-sommer/raku/ch-1.raku b/challenge-307/arne-sommer/raku/ch-1.raku
new file mode 100755
index 0000000000..7cdcfc635f
--- /dev/null
+++ b/challenge-307/arne-sommer/raku/ch-1.raku
@@ -0,0 +1,23 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@ints where @ints.elems >= 2 && all(@ints) ~~ Int,
+               :v(:$verbose));
+
+my @ordered = @ints.sort;
+
+my @indices;
+
+for ^@ints.elems -> $index
+{
+  if @ints[$index] == @ordered[$index]
+  {
+    say ": Index $index: @ints[$index] == @ordered[$index] *" if $verbose;
+  }
+  else
+  {
+    @indices.push: $index;
+    say ": Index $index: @ints[$index] != @ordered[$index]" if $verbose;
+  }
+}
+
+say "({ @indices.join(", ") })";
diff --git a/challenge-307/arne-sommer/raku/ch-2.raku b/challenge-307/arne-sommer/raku/ch-2.raku
new file mode 100755
index 0000000000..7e36e25b6e
--- /dev/null
+++ b/challenge-307/arne-sommer/raku/ch-2.raku
@@ -0,0 +1,30 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@words where @words.elems > 0, :v(:$verbose));
+
+my %canonical;
+
+@words.map({ %canonical{$_} = $_.lc.comb.sort.join });
+
+@words.map({ say ": Canonical of: $_ -> %canonical{$_}" }) if $verbose;
+
+my $index = 0;
+
+loop
+{
+  last if @words.elems == 0;
+  last if @words.end   == $index;
+
+  if %canonical{@words[$index + 0]} eq %canonical{@words[$index + 1]}
+  {
+    print ": Dropping @words[$index + 0] (index $index)" if $verbose;
+    @words.splice($index,1);
+    say " -> ({ @words.join(",") })" if $verbose;
+  }
+  else
+  {
+    $index++;
+  }
+}
+
+say @words.elems;
diff --git a/challenge-307/arne-sommer/raku/check-order b/challenge-307/arne-sommer/raku/check-order
new file mode 100755
index 0000000000..7cdcfc635f
--- /dev/null
+++ b/challenge-307/arne-sommer/raku/check-order
@@ -0,0 +1,23 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@ints where @ints.elems >= 2 && all(@ints) ~~ Int,
+               :v(:$verbose));
+
+my @ordered = @ints.sort;
+
+my @indices;
+
+for ^@ints.elems -> $index
+{
+  if @ints[$index] == @ordered[$index]
+  {
+    say ": Index $index: @ints[$index] == @ordered[$index] *" if $verbose;
+  }
+  else
+  {
+    @indices.push: $index;
+    say ": Index $index: @ints[$index] != @ordered[$index]" if $verbose;
+  }
+}
+
+say "({ @indices.join(", ") })";
diff --git a/challenge-307/arne-sommer/raku/find-anagrams b/challenge-307/arne-sommer/raku/find-anagrams
new file mode 100755
index 0000000000..7e36e25b6e
--- /dev/null
+++ b/challenge-307/arne-sommer/raku/find-anagrams
@@ -0,0 +1,30 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@words where @words.elems > 0, :v(:$verbose));
+
+my %canonical;
+
+@words.map({ %canonical{$_} = $_.lc.comb.sort.join });
+
+@words.map({ say ": Canonical of: $_ -> %canonical{$_}" }) if $verbose;
+
+my $index = 0;
+
+loop
+{
+  last if @words.elems == 0;
+  last if @words.end   == $index;
+
+  if %canonical{@words[$index + 0]} eq %canonical{@words[$index + 1]}
+  {
+    print ": Dropping @words[$index + 0] (index $index)" if $verbose;
+    @words.splice($index,1);
+    say " -> ({ @words.join(",") })" if $verbose;
+  }
+  else
+  {
+    $index++;
+  }
+}
+
+say @words.elems;